build: add docker output for non-moby drivers

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

util/progress/fromreader.go

@@ -0,0 +1,40 @@
+package progress
+
+import (
+	"io"
+	"io/ioutil"
+	"time"
+
+	"github.com/moby/buildkit/client"
+	"github.com/moby/buildkit/identity"
+	"github.com/opencontainers/go-digest"
+)
+
+func FromReader(w Writer, name string, rc io.ReadCloser) {
+	status := w.Status()
+	dgst := digest.FromBytes([]byte(identity.NewID()))
+	tm := time.Now()
+
+	vtx := client.Vertex{
+		Digest:  dgst,
+		Name:    name,
+		Started: &tm,
+	}
+
+	status <- &client.SolveStatus{
+		Vertexes: []*client.Vertex{&vtx},
+	}
+
+	_, err := io.Copy(ioutil.Discard, rc)
+
+	tm2 := time.Now()
+	vtx2 := vtx
+	vtx2.Completed = &tm2
+	if err != nil {
+		vtx2.Error = err.Error()
+	}
+	status <- &client.SolveStatus{
+		Vertexes: []*client.Vertex{&vtx2},
+	}
+	close(status)
+}

util/progress/reset.go

@@ -0,0 +1,71 @@
+package progress
+
+import (
+	"time"
+
+	"github.com/moby/buildkit/client"
+)
+
+func ResetTime(in Writer) Writer {
+	w := &pw{Writer: in, status: make(chan *client.SolveStatus), tm: time.Now()}
+	go func() {
+		for {
+			select {
+			case <-in.Done():
+				return
+			case st, ok := <-w.status:
+				if !ok {
+					close(in.Status())
+					return
+				}
+				if w.diff == nil {
+					for _, v := range st.Vertexes {
+						if v.Started != nil {
+							d := v.Started.Sub(w.tm)
+							w.diff = &d
+						}
+					}
+				}
+				if w.diff != nil {
+					for _, v := range st.Vertexes {
+						if v.Started != nil {
+							d := v.Started.Add(-*w.diff)
+							v.Started = &d
+						}
+						if v.Completed != nil {
+							d := v.Completed.Add(-*w.diff)
+							v.Completed = &d
+						}
+					}
+					for _, v := range st.Statuses {
+						if v.Started != nil {
+							d := v.Started.Add(-*w.diff)
+							v.Started = &d
+						}
+						if v.Completed != nil {
+							d := v.Completed.Add(-*w.diff)
+							v.Completed = &d
+						}
+						v.Timestamp = v.Timestamp.Add(-*w.diff)
+					}
+					for _, v := range st.Logs {
+						v.Timestamp = v.Timestamp.Add(-*w.diff)
+					}
+				}
+				in.Status() <- st
+			}
+		}
+	}()
+	return w
+}
+
+type pw struct {
+	Writer
+	tm     time.Time
+	diff   *time.Duration
+	status chan *client.SolveStatus
+}
+
+func (p *pw) Status() chan *client.SolveStatus {
+	return p.status
+}